AD8421 datasheet(16/28 Pages) AD

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LT6372-1

Rev. 0

For more information www.analog.com

APPLICATIONS INFORMATION

+–

LT6370

6372-1 F01a

V–

–15V

+15V

V+

REF1,2

OUT

VD/2

VCM

LT6372-1

OUTPUT VOLTAGE (V)

–15

–10

–5

–15

–10

–5

6372-1 F01b

G = 1

VS = ±15V

VREF2 = 0V

VREF1 = 0V

VCLHI = 15V

VCLLO = –15V

+–

LT6370

6371-2 F01c

V–

–15V

+15V

V+

REF1,2

OUT

243

LT6372-1

VD/2

VCM

OUTPUT VOLTAGE (V)

–15

–10

–5

–15

–10

–5

6372-1 F01d

G = 100

VS = ±15V

VREF2 = 0V

VREF1 = 0V

VCLHI = 15V

VCLLO = –15V

applied to an ADCs input. Typically, CLHI is tied to the

ADC’s reference and CLLO is tied to the ADC’s ground

connection.

Valid Input and Output Range

Instrumentation amplifiers traditionally specify a valid

input common mode range and an output swing range.

This however often fails to identify limitations associated

with internal swing limits. Referring to the Simplified

Block Diagram, the output swing of pre-amplifiers A1

and A2 as well as the common-mode input range of the

difference amplifier A3 impose limitations on the valid

operating range. Figure 1 shows the operating region

where a valid output is produced for various configura-

tions. Further valid input and output range plots can be

generated using the Diamond Plot Tool.

Figure 1. Input Common Mode Range vs Output Voltage

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